101021111101021 has 4 divisors (see below), whose sum is σ = 101579238786844. Its totient is φ = 100462983415200.

The previous prime is 101021111100979. The next prime is 101021111101069. The reversal of 101021111101021 is 120101111120101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17824566267225 + 83196544833796 = 4221915^2 + 9121214^2 .

It is a cyclic number.

It is not a de Polignac number, because 101021111101021 - 2⁹ = 101021111100509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101021111100992 and 101021111101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021111101721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279063842640 + ... + 279063843001.

It is an arithmetic number, because the mean of its divisors is an integer number (25394809696711).

Almost surely, 2^{101021111101021} is an apocalyptic number.

It is an amenable number.

101021111101021 is a deficient number, since it is larger than the sum of its proper divisors (558127685823).

101021111101021 is an equidigital number, since it uses as much as digits as its factorization.

101021111101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558127685822.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 101021111101021 its reverse (120101111120101), we get a palindrome (221122222221122).

The spelling of 101021111101021 in words is "one hundred one trillion, twenty-one billion, one hundred eleven million, one hundred one thousand, twenty-one".